Cmake scripts for MSVC precompiled headers

CMakeLists.txt

@@ -34,6 +34,7 @@ endif(WIN32)
 find_package(MaxSDK)          #TODO: Only find this if we are building PlasmaMax
 find_package(Bink)            #TODO: Find Bink, but don't require it if plPipeline isn't built...
 #                                    Or better yet, just eliminate bink altogether
+include(PrecompiledHeader)    #Precompiled Header helper macros
 
 # libCurl isn't smart enough to detect this for us, so we have to configure it ourselves
 option(CURL_IS_STATIC "Using the static version of libcurl?" ON)

cmake/PrecompiledHeader.cmake

@@ -0,0 +1,23 @@
+if(MSVC)
+    set(PCH_SUPPORTED TRUE)
+else()
+    set(PCH_SUPPORTED FALSE)
+endif()
+
+if(PCH_SUPPORTED)
+    option(PLASMA_USE_PCH "Enable precompiled headers?" ON)
+endif(PCH_SUPPORTED)
+
+macro(use_precompiled_header PrecompiledHeader PrecompiledSource)
+    if(PLASMA_USE_PCH)
+        if(MSVC)
+            get_filename_component(PrecompiledBasename ${PrecompiledHeader} NAME_WE)
+            set(PrecompiledBinary ${PrecompiledBasename}.pch)
+
+            add_definitions(/Fp"${PrecompiledBinary}")
+            add_definitions(/Yu"${PrecompiledHeader}")
+            add_definitions(/FI"${PrecompiledHeader}")
+            set_source_files_properties(${PrecompiledSource} PROPERTIES COMPILE_FLAGS "/Yc\"${PrecompiledHeader}\"")
+        endif(MSVC)
+    endif(PLASMA_USE_PCH)
+endmacro(use_precompiled_header)